You can use your water meter to help you determine if you have an outdoor faucet leak. Turn off water to all faucets and toilets in the house as well as to all outdoor faucets. Then write down the meter reading from your water meter. Wait 10 or 15 minutes without using any water and check the meter again. Compare the second meter reading to the first one that you have written down. If there is any difference between the two meter readings, there is definitely a leak somewhere. Turn the water back on to everything, checking each faucet for leaks in the process of restoring the water supply.